<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<script src='jquery源码分析.js'></script>
<script>
	//pushStack();//219行有点像电梯，先进后出  12集
	$(function(){
		$('div').pushStack($('span')).css('background','red').end().css('background','blue');//end()与prevObject是同一回事
	});
</script>
<body>
	<div>div</div>
	<span>span</span>
</body>
</html>